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Method for preparing iodate

A technology of iodate and iodic acid, which is applied in the direction of iodine oxygen compounds, etc., can solve the problems of complex separation process, unreported, low yield of electrolysis, etc.

Inactive Publication Date: 2017-01-04
颜笑天
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Disproportionation method, electrolysis method Due to low yield and complicated separation, there are no industrial reports
Potassium chlorate oxidation method has many by-products (KCl, Cl 2 、KNO 3 etc.), especially the toxic chlorine gas needs to be recovered, so there are disadvantages such as complex separation process, long process, high energy consumption, low product quality, high cost, etc., making this method unfavorable for promotion in enterprises
[0017] About adopting neutralization method, the industrial production method of directly producing potassium iodate with iodic acid has not been reported so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In a 500-liter reactor, add 100 kilograms of distilled water, 50 kilograms of hydrogen peroxide (according to 100%), 2 liters of nitric acid (98%), and 40 kilograms of refined iodine, stir constantly, and control the temperature at 70°C Under the condition of above, react 4 hours, can make content and be 300 kilograms of iodic acid solution of 18%, the yield of iodic acid is 98% (taking iodine amount as a benchmark). Then under the condition of temperature 50 DEG C, constantly stir, and slowly add the potassium carbonate solution that concentration is 40%, make the pH value of reaction solution equal to 7, the adding total amount of potassium carbonate solution is 61 kilograms. The precipitated crystals are filtered through a filter, and the mother liquor is returned to the reactor for evaporation and recrystallization. The crystals can be rinsed with distilled water, and finally the washed crystals are dried at 100°C until the water content is less than 0.5%, and the fi...

Embodiment 2

[0046] In a 500-liter reactor, add 20 kg of deionized water, 40 kg of refined iodine, 60 kg of hydrogen peroxide (100%), and 20 kg of chloric acid (concentration is 10%), under constant stirring, control the temperature Reaction under the condition of 90 ℃ for 8 hours, available content is 235 kilograms of iodic acid solution of 23%, and iodic acid yield is 98% (in iodine). After reducing the temperature of the iodic acid solution to 20°C, slowly add potassium carbonate solution with a concentration of 40% until the pH value is equal to 7, and add 64 kg of potassium carbonate solution. At this time, the precipitated crystals enter the filter for filtration, and the mother liquor is evaporated and crystallized to recover potassium iodate. After the filtered potassium iodate crystals are rinsed with deionized water, the crystals are taken out and dried at 75°C until the water content is less than 0.5%. 59.4 kilograms of finished product potassium iodate can be obtained, and its ...

Embodiment 3

[0048]In the reactor of -500 liters, add 40 kilograms of refined iodine, 52 kilograms of hydrogen peroxide (100%), 100 kilograms of distilled water, 20 kilograms of 10% iodic acid solution at a concentration of 20 kilograms, constantly stir at 90 ° C, and react 6 hours, can make content and be 281 kilograms of iodic acid solution of 20%, calculate with iodine, the yield of iodic acid is 98%. The temperature of this iodic acid solution is lowered to 30°C, and slowly add potassium carbonate solution with a concentration of 40%, until the pH value of the solution is equal to 7. Add 56 kilograms of this potassium carbonate solution altogether, filter the reaction slurry that has precipitated crystallization, mother liquor is evaporated again to reclaim potassium iodate, the crystallization that is filtered is rinsed with distilled water, then takes out crystallization and dries at 95°C until the free moisture is lower than 0.5%, promptly gets 61 kilograms of finished product potas...

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PUM

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Abstract

The invention relates to an industrial method for preparing pure iodic acid and a salt thereof. According to the method, pure iodine is oxidized by hydrogen peroxide, a small amount of nitric acid or oxoacid or non-oxoacid of halogen is added to prepare pure iodic acid solution, the yield of the pure iodic acid solution can reach 98% on the basis of iodine, hydroxide or carbonate of alkali metal is adopted to neutralize an iodic acid solution, so that the pH of the iodic acid solution is equal to 7, crystal of the pure iodate can be prepared, and the crystal is washed and dried to obtain the finished product. The purity of the iodate reaches 99.0%, and the yield of the iodate is 85-95% on the basis of iodic acid.

Description

technical field [0001] The invention relates to a preparation method of iodate. Background technique [0002] Iodic acid is one of the oxyacids of iodine with the molecular formula HIO 3 , industrially used as pharmaceutical synthesis intermediates, catalysts, chemical reagents. Salts of alkali metals (such as sodium, potassium) and alkaline earth metals (such as calcium, barium) are commonly used in iodates, among which potassium iodate can be used as a reference reagent in chemical analysis, and can also be used as an iodine supplement, such as Salt iodine. Calcium iodate is used as an additive in food and feed. These products are produced both at home and abroad. [0003] The preparation method of disclosed iodic acid and its salts both at home and abroad is introduced as follows: [0004] (1) the preparation method of iodic acid: [0005] (1), chlorine oxidation method [1]: [0006] (2), concentrated nitric acid oxidation method 〔 1 、 2 〕 : [0007] (3), hyd...

Claims

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Application Information

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IPC IPC(8): C01B11/22
Inventor 颜笑天
Owner 颜笑天
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